Imam jawad (PBUH)
whether it was for the first time of he had done it previously;
also whether, that victim was a bird or some other creature;
whether the prey was small or big;
whether he hunted in the day or at night;
whether the hunter repented for his action of persisted in it ;
whether he hunted secretly of openly ;
Whether the Ehram was for `umrah of for hajj. Unless all these points are explained no specific answer can be given to this question." al-Qadi Yahya was staggered in listening to these words of the Imam and the entire gathering was dumbfounded.
There was no limit to al-Ma'mun's pleasure. He expressed his sentiments of joy and admiration thus, "Bravo! Well done! O Abu Ja`far! (Ahsanta, ahsanta ya Aba Ja`far ) , your learning and attainments are beyond all praises." As al-Ma'mun wanted that the Imam's opponent be fully exposed, he said to the Imam, "You may also put some question to Yahya ibn Aktham." Then Yahya also reluctantly said to the Imam, "Yes, you may ask me some questions. If I know the answer, I will tell you; otherwise , I shall request you to give its answer." Thereupon, the Imam asked a Question to which Yahya could not reply. Eventually, the Imam answered his question.
Then al-Ma'mun addressed the audience thus: Did I not say that the Imam comes of a family which has been chosen by Allah as the repository of knowledge and learning? Is there any one in the world who can match even the children of this family? "All of them shouted," Undoubtedly there in no one parallel to Muhammad ibn ` Ali al-Jawad." In the some assemble al-Ma'mun wedded his daughter ummu 'l-Fadl to the Imam and liberally distributed charity and gifts among his subjects as a mark of rejoicing. One year after his marriage the Imam returned to Medina from Baghdad with his wife and there he set about preaching the commandments of Allah.
when after the death of al-Ma'mun, al-mu`tasim ascended the throne, he got and opportunity to persecute the Imam and to ventilate spite and malice against him. He summoned the Imam to Baghdad. The Imam arrived atBaghdad on 9th Muharram 220 AH and al-Mu`tasim got him poisoned in the same year. He was martyred on 29 th Dhi'lqi`dah 220 AH and was buried beside his grandfather, Imam Mussa al-Kazim the Seventh Imam, in al-Kazimiyyah , in the suburb of Baghdad (Iraq).